| Code/Flag Figure |
Description |
Status |
|
0
|
Isolated cumulus humilis and/or cumulus mediocris of vertical development
|
Operational
|
|
1
|
Numerous cumulus humilis and/or cumulus mediocris of vertical development
|
Operational
|
|
2
|
Isolated cumulus congestus of vertical development
|
Operational
|
|
3
|
Numerous cumulus congestus of vertical development
|
Operational
|
|
4
|
Isolated cumulonimbus of vertical development
|
Operational
|
|
5
|
Numerous cumulonimbus of vertical development
|
Operational
|
|
6
|
Isolated cumulus and cumulonimbus of vertical development
|
Operational
|
|
7
|
Numerous cumulus and cumulonimbus of vertical development
|
Operational
|
|
8-9
|
Reserved
|
Operational
|
|
10
|
Reserved
|
Operational
|
|
11
|
Isolated orographic clouds, pileus, incus, forming
|
Operational
|
|
12
|
Isolated orographic clouds, pileus, incus, not changing
|
Operational
|
|
13
|
Isolated orographic clouds, pileus, incus, dissolving
|
Operational
|
|
14
|
Irregular banks of orographic cloud, föhn bank, etc., forming
|
Operational
|
|
15
|
Irregular banks of orographic cloud, föhn bank, etc., not changing
|
Operational
|
|
16
|
Irregular banks of orographic cloud, föhn bank, etc., dissolving
|
Operational
|
|
17
|
Compact layer of orographic cloud, föhn bank, etc., forming
|
Operational
|
|
18
|
Compact layer of orographic cloud, föhn bank, etc., not changing
|
Operational
|
|
19
|
Compact layer of orographic cloud, föhn bank, etc., dissolving
|
Operational
|
|
20
|
All mountains open, only small amounts of cloud present
|
Operational
|
|
21
|
Mountains partly covered with detached clouds (not more than half the peaks can be seen)
|
Operational
|
|
22
|
All mountain slopes covered, peaks and passes free
|
Operational
|
|
23
|
Mountains open on observer’s side (only small amounts of cloud present), but a continuous wall of cloud on the other side
|
Operational
|
|
24
|
Clouds low above the mountains, but all slopes and mountains open (only small amounts of cloud on the slopes)
|
Operational
|
|
25
|
Clouds low above the mountains, peaks partly covered by precipitation trails or clouds
|
Operational
|
|
26
|
All peaks covered but passes open, slopes either open or covered
|
Operational
|
|
27
|
Mountains generally covered but some peaks free, slopes wholly or partially covered
|
Operational
|
|
28
|
All peaks, passes and slopes covered
|
Operational
|
|
29
|
Mountains cannot be seen owing to darkness, fog, snowstorm, precipitation, etc.
|
Operational
|
|
30-34
|
Reserved
|
Operational
|
|
35
|
Non-persistent condensation trails
|
Operational
|
|
36
|
Persistent condensation trails covering less than 1/8 of the sky
|
Operational
|
|
37
|
Persistent condensation trails covering 1/8 of the sky
|
Operational
|
|
38
|
Persistent condensation trails covering 2/8 of the sky
|
Operational
|
|
39
|
Persistent condensation trails covering 3/8 or more of the sky
|
Operational
|
|
40
|
No cloud or mist observed from a higher level
|
Operational
|
|
41
|
Mist, clear above observed from a higher level
|
Operational
|
|
42
|
Fog patches observed from a higher level
|
Operational
|
|
43
|
Layer of slight fog observed from a higher level
|
Operational
|
|
44
|
Layer of thick fog observed from a higher level
|
Operational
|
|
45
|
Some isolated clouds observed from a higher level
|
Operational
|
|
46
|
Isolated clouds and fog below observed from a higher level
|
Operational
|
|
47
|
Many isolated clouds observed from a higher level
|
Operational
|
|
48
|
Sea of clouds observed from a higher level
|
Operational
|
|
49
|
Bad visibility obscuring the downward view observed from a higher level
|
Operational
|
|
50-510
|
Reserved
|
Operational
|
|
511
|
Missing value
|
Operational
|